package com.jy.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.jy.reggie.common.BaseContext;
import com.jy.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/*
检查用户是否完成登录
* */
@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request =(HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
//        1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"
        };

//        2.判断本次请求是否需要处理
        boolean check = check(urls,requestURI);

//        3.如果不需要处理，则直接放行
        log.info("本次请求{}不需要处理",requestURI);
        if(check){
            filterChain.doFilter(request,response);
            return;
        }

//        4-1.判断登录状态，如果已登录，则直接放行如果
        if(request.getSession().getAttribute("employee")!= null){
            log.info("用户已登入");
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

//        4-2.判断登录状态，如果已登录，则直接放行如果
        if(request.getSession().getAttribute("user")!= null){
            log.info("用户已登入");
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }


//        5.未登录则返回未登录结果,通过输出流方式向客户端页面响应数据
        log.info("用户未登入");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }


    /**
     * 检查这次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if(match){return true;}
        }
        return false;
    }
}
